CN104469801B - A kind of urban track traffic CBTC vehicle-ground wireless communication signal coverage methods - Google Patents
A kind of urban track traffic CBTC vehicle-ground wireless communication signal coverage methods Download PDFInfo
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- CN104469801B CN104469801B CN201410611014.7A CN201410611014A CN104469801B CN 104469801 B CN104469801 B CN 104469801B CN 201410611014 A CN201410611014 A CN 201410611014A CN 104469801 B CN104469801 B CN 104469801B
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- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L15/00—Indicators provided on the vehicle or train for signalling purposes
- B61L15/0018—Communication with or on the vehicle or train
- B61L15/0027—Radio-based, e.g. using GSM-R
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/20—Trackside control of safe travel of vehicle or train, e.g. braking curve calculation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The invention discloses a kind of urban track traffic CBTC vehicle-ground wireless communication signal coverage methods, this method is combined using leaky cable, smart antenna, realizes that urban track traffic CBTC train signal system vehicle-ground wireless communications signal covers.It overcomes the drawbacks of tradition carries out signal covering based on 802.11x series techniques and using radio-frequency antenna or leakage waveguide.The present invention realizes substantially no longer to be needed to lay active equipment in track section, and the base station signal juxtaposition covering in section for passing through adjacent station, ensure after causing a seat coach station communication and signal equipment failure because of reasons such as dead electricity, the CBTC system vehicle-ground communications of whole circuit can continue to keep, reliability, availability and the maintainability of high degree lifting system, provide safeguard for subway train safe operation.
Description
Technical field
The present invention relates to wireless signal transmission techniques field, especially a kind of urban track traffic CBTC vehicle-ground wireless communications
Signal coverage method.
Background technology
CBTC（Communication Based Train Control System）The train based on wireless communication from
Autocontrol system, using advanced communication, computer technology, continuous control and monitoring train operation, to be based on instead of tradition
Track circuit realizes the train signal system of Train Detection and Identification.
For CBTC since 2004 introduce China, urban rail transit in China new route uses CBTC technologies, wherein
Vehicle-ground wireless communication system all uses the 802.11X series wireless broad band technologies of 2.4GHz ISM bands, wireless signal covering side
Formula has two kinds：First, use Common radio frequency antenna, the signal that driving section is completed by free space wave covers, second, using into
The signal uniform fold in the transmission of radio wave and section of driving a vehicle is completed in this very high leakage waveguide.
According to currently existing scheme, just need to install wirelessly in trackside per every about 100 to 300 meters along subway driving section
Transceiver（AP）, this brings very big difficulty to management, the maintenance of CBTC signal systems, and each city underground operator is exhaled
More preferable solution is called out, is avoided as far as possible in driving section deployment active equipment（Including wireless base station, transmission, power supply etc.）.
In China's metro operation, once occurred because a station CBTC signalling arrangements dead electricity causes system cisco unity malfunction,
Circuit operation enters manual dispatching pattern, because of human operational error, causes to stop in section in front of a train from overtaking collision and awaits orders separately
One train.After accident, subway signal expert proposes：In order to avoid similar accident occurs again, can further improve
CBTC systems so that after the station signalling arrangement caused by a seat coach station dead electricity exits service, the CBTC cars of all fronts train ground nothing
Line communication can also keep working normally.
Repeatedly there is subway train and stop because being subject to the interference of mobile phone WiFi to be forced in November, 2012, media report China subway
Phenomenon.Therefore, expert call uses special frequency resource, substitute towards the public, the 2.4GHz ISM bands of Full-open, come
CBTC signal train-ground communications are carried, eliminate interference hidden danger.
It would therefore be highly desirable to a kind of new wireless signal soverlay technique scheme is proposed, to solve the above problems.
The content of the invention
The purpose of the present invention is the car-ground radio subsystem for existing urban track traffic CBTC train signal systems
Shortcoming and a kind of urban track traffic CBTC vehicle-ground wireless communication signal coverage methods proposed, to solve existing ask
Inscribe, avoid risk, strengthen and lifted the reliability, availability and maintainability of CBTC car-ground radio subsystems, be preferably row
Car provides safeguard safely.
The object of the present invention is achieved like this：
A kind of urban track traffic CBTC vehicle-ground wireless communication signal coverage methods, this method include：
(1), by the combination application of leaky cable and smart antenna, the covering of CBTC vehicle-ground wireless communication signals is completed
A, the common section of main track
By base station, power supply, the installation of transmission active equipment AT STATION, along track continuous laying leaky cable, place will AT STATION
Leaky cable blocks；Base station signal is linked into leaky cable after the signal distribution system that combiner or electric bridge form；
B, main track is more than 2.0 kilometers of the long section in underground
Equally by base station, power supply, the installation of transmission active equipment AT STATION, along track continuous laying leaky cable, AT STATION
Leaky cable is blocked at place, while blocks leaky cable in the middle part of section, and also mounted base station, power supply, transmission have here
Source device, base station signal are linked into leaky cable after the signal distribution system that combiner or electric bridge form.
C, main track is more than 2.0 kilometers of the long section in ground
Mounted base station, power supply, transmission active equipment and smart antenna, section no longer configure active equipment AT STATION；
For not possessing the station of smart antenna mounting condition, leaky cable is continuously laid along track in corresponding section,
Leaky cable is blocked in the position that every 2-2.5 kilometers nearby has overhead column, by base station, power supply, transmission active equipment installation
On the column below track, by radio-frequency cable by the upward feed-in leaky cable of base station signal；
For there was only the station of side laying leaky cable, in the side of the station non-bleeding cable intelligent day of configuration orientation
Line；Do not lay the station of leaky cable for both sides section, omnidirectional intelligent aerial is configured at the station.
D, parking lot and rolling stock section
Enter from main track on the branch line of rolling stock section, along track laying leaky cable；Rolling stock section and the outfield in parking lot,
Smart antenna is installed at signal box；In garage, according to conventional wireless indoor distribution mode using radio-frequency cable, leaky cable
Signal covering is completed with miniature antenna.
(2), the wireless signal juxtaposition covering track section at adjacent station, it is ensured that train begins on main track interval circuit
The signal from nearest two seat coach station can be received at the same time eventually, realize the remote backup route between train and ground
A, the leaky cable for being laid on section is directly connected into uplink and downlink base station, i.e. the base station at section uplink and downlink station shares
The leaky cable in section is penetrated through, it is by appropriate design and high by adjusting base station power and smart antenna in implementation process
Degree, rationally controls coverage, and overlapped coverage is formed in track section.
B, all base stations are synchronized using gps satellite or Big Dipper satellite signal clock source, avoid interfering with each other between base station.
(3), two-wire solid in ground crosses the covering of the wireless communication signals of transfer stop
A, each line lays leaky cable in transfer stop uplink and downlink section.
B, dividing frequency resource is optimized
(i), two resources of R1 and R2, each 1.5MHz bandwidth, using R1R2R1R2 multiplexer modes, for non-transfer are divided into
Common section.
(ii), tetra- resources of r1, r2, r3, r4, each 750KHz bandwidth are divided into；In transfer stop, circuit A uses r1 and r2,
Circuit B uses r3 and r4；A set of base station equipment is disposed again respectively in the uplink and downlink section of each line belonging to transfer stop；Frequency is drawn
It is divided into, circuit A：【R2】-r1-【r2】-r1-【R2】,【R1】-r3-【r4】-r3-【R1】；Wherein,【r2】【r4】For transfer stop,
【R2】【R1】Respectively uplink and downlink station, r1r3 add base station for section.
Beneficial effects of the present invention：
(1) rationally avoid and active equipment is installed in track section；
(2) ensure that train can be respectively connected to the base station at section both ends all the time, dual, strange land route is provided for train, it is ensured that
After one seat coach station causes equipment failure because of reasons such as dead electricity, train can continue to keep the communication with ground；
(3) avoid interfering with each other between transfer circuit.
Embodiment
The present invention is to be covered in driving section using a kind of CBTC car-ground radios of leaky cable and smart antenna mixed networking
Lid method.The scheme being combined using leaky cable and smart antenna, is substituted traditional radio-frequency antenna or leakage waveguide, completes city
Radio wave propagation and the signal covering of city's track traffic CBTC car-ground radio systems.
（1）Frequency resource is selected with technical standard
According to Ministry of Industry and Information without letter 2012【52】Number text, track traffic CBTC car-ground radios are as a kind of " trade Special Network business "
（With reference to Ministry of Industry and Information without letter 2012【52】Number text first）, metro company can be to radio control department application 406.5-
409.5MHz frequency resources, and according to YD/T2115-2010 and YD/T2117-2010 standard configuration equipment（With reference to Ministry of Industry and Information without
Letter 2012【52】Number literary Article 3）, carry CBTC vehicle-ground wireless communication business.
In 406.5-409.5MHz frequency ranges, leaky cable and intelligent antenna technology are highly developed, and optional product is more.And
The radio wave of this frequency range is very suitable for transmitting by leaky cable, is one of optimum frequency band for applying leaky cable, effectively
Transmission range is more than 2 kilometers, meets most of urban track traffic demand.
The equipment for meeting YD/T2115-2010 and YD/T2117-2010 standards supports intelligent antenna technology.Smart antenna skill
Art is the core technology of the third generation and forth generation mobile communication, passes through the automatic adjusument of phase and power so that electromagnetic wave gathers
Jiao is a wave beam, and automatic tracing mobile terminal, is practically applicable to suburb aerial conveyor, and effective coverage distance can be more than 10 kilometers.
（2）Covering design
According to general electromagnetic wave propagation theory, routinely covering design method does link budget, calculates by leakage
Cable or the electromagnetic wave signal of smart antenna radiation are along track and the signal of rolling stock section, parking lot and garage Nei Ge regions
Field strength distribution.In the design process, the signal distribution nothing such as high or change combiner, electric bridge is hung by adjusting transmission power, antenna
The antenna of source device or different index parameters, to adjust signal strength distribution.Controlled by rational design so that signal field
Meet the primary demand of train-ground communication by force, and leave surplus（It is recommended that it is not less than 6dB）, while meet on main line track section,
Just realize that juxtaposition covers, i.e., vehicle can be linked into two neighboring base station.
, it is necessary to by design after urban track traffic forms networking scale, suitable control signal distributions, avoid line
Interfered with each other between road.In the case of using smart antenna, using same design method, reasonable control signal intensity, makes it
Just cover the scope of needs, and must ensure to be propagate directly to up to the ground main track region of nearest other same frequencys by antenna or
Other parking lots, rolling stock section（If there is such situation）Signal strength, less than the locality signal strength 18dB of itself with
On.If pass through design, it is impossible to reach this index, then should not use smart antenna herein, need to change into as leaky cable.
（3）Synchronization scenario
In order to realize juxtaposition covering, it is necessary to directly connect the wireless base station device at adjacent station using leaky cable,
Relative to free-space propagation, transmission loss of the electromagnetic wave in leaky cable is much smaller, and therefore, which is brought
Maximum technical problem, exactly need to avoid interfering with each other between adjacent base station.Above-mentioned YD/T2115-2010 and YD/T2117-
The existing mainstream wireless broad band technology of 2010 standards and China, using time division synchronous mode, base station equipment all may be used in system
Stringent synchronization is carried out with reference to GPS or big-dipper satellite clock source, same hair is same to be received, and then has dexterously evaded base station because leaky cable
It is direct-connected and may caused by interfere with each other.Make it that juxtaposition covers.
（4）Frequency resource programme：
406.5-409.5MHz has 3,000,000 frequency resources altogether, mutually dry between circuit both to meet transmission bandwidth demand or avoiding
Disturb, following resource optimization scheme can be used：
Frequency resource splitting scheme one：406.5-409.5MHz frequency ranges are divided into two groups of resources, R1, R2, each 1.5MHz
Bandwidth.
Frequency resource splitting scheme two：406.5-409.5MHz frequency ranges are divided into four groups of resources, r1, r2, r3, r4, respectively
750KHz bandwidths.
When planning network, above-mentioned two scheme is used in combination.For common rail section, using frequency resource
Splitting scheme one, carries out channeling on circuit by way of " R1R2R1R2 ".For two line of ground in the case of of crossing（Note：
Because of the inherent feature of leaky cable, its attenuation is exceedingly fast, exponentially declines, so only considering what adjacent two lines crossed
Situation）, using frequency resource splitting scheme two, i.e., in junction station and section, two lines use r1r2 and r3r4 respectively, so as to keep away
Exempt to interfere with each other between circuit.But because frequency resource bandwidth halves, cause the transmission bandwidth of train-ground communication also accordingly to reduce
Half.In order to keep transmission bandwidth constant, a set of base station can be disposed again respectively in the uplink and downlink section of each line belonging to transfer stop
Equipment, by increasing resource come hoist capacity.I.e.：Frequency plannings of the circuit A in transfer stop be：【R2】-r1-【r2】-r1-
【R2】, note：【r2】For transfer stop,【R2】Respectively uplink and downlink station, r1 are the base station that section is added；Circuit B is in transfer stop
Frequency planning is：【R1】-r3-【r4】-r3-【R1】, note：【r4】For transfer stop,【R1】Respectively uplink and downlink station, r3 are section
Add base station.
Claims (1)
1. a kind of urban track traffic CBTC vehicle-ground wireless communication signal coverage methods, it is characterised in that this method includes：
(1), by the combination application of leaky cable and smart antenna, the covering of CBTC vehicle-ground wireless communication signals is completed
A, the common section of main track
By base station, power supply, the installation of transmission active equipment AT STATION, along track continuous laying leaky cable, place will leakage AT STATION
Cable blocks；Base station signal is linked into leaky cable after the signal distribution system that combiner or electric bridge form；
B, main track is more than 2.0 kilometers of the long section in underground
Equally by base station, power supply, the installation of transmission active equipment AT STATION, along track continuous laying leaky cable, place will AT STATION
Leaky cable blocks, while blocks leaky cable in the middle part of section, and also mounted base station, power supply, transmission active are set here
Standby, base station signal is linked into leaky cable after the signal distribution system that combiner or electric bridge form；
C, main track is more than 2.0 kilometers of the long section in ground
Mounted base station, power supply, transmission active equipment and smart antenna, section are not configured with source device AT STATION；
For not possessing the station of smart antenna mounting condition, leaky cable is continuously laid along track in corresponding section, every
Leaky cable is blocked in the 2-2.5 kilometers of positions for nearby having overhead column, and base station, power supply, transmission active equipment installation is in-orbit
On column below road, by radio-frequency cable by the upward feed-in leaky cable of base station signal；
For there was only the station of side laying leaky cable, the side of non-bleeding cable configures directional intelligent antenna AT STATION；It is right
Do not lay the station of leaky cable in both sides section, configure omnidirectional intelligent aerial AT STATION；
D, parking lot and rolling stock section
Enter from main track on the branch line of rolling stock section, along track laying leaky cable；Rolling stock section and the outfield in parking lot, in signal
Smart antenna is installed at building；In garage, according to conventional wireless indoor distribution mode using radio-frequency cable, leaky cable and small
Antenna completes signal covering；
(2), the wireless signal juxtaposition covering track section at adjacent station, it is ensured that train all the time can on main track interval circuit
The signal from nearest two seat coach station is received at the same time, realizes the remote backup route between train and ground
A, the leaky cable for being laid on section is directly connected into uplink and downlink base station, i.e. the base station at section uplink and downlink station shares perforation
The leaky cable in section, by adjusting base station power and smart antenna height by appropriate design and in implementation process, is closed
Reason control coverage, overlapped coverage is formed in track section；
B, all base stations are synchronized using gps satellite or Big Dipper satellite signal clock source, avoid interfering with each other between base station；
(3), wireless communication signals covering ground two-wire crosses transfer stop
A, each line lays leaky cable in the uplink and downlink section of transfer stop；
B, dividing frequency resource is optimized
(i), two resources of R1 and R2, each 1.5MHz bandwidth, using R1R2R1R2 multiplexer modes, for the general of non-transfer are divided into
Logical section；
(ii), tetra- resources of r1, r2, r3, r4, each 750KHz bandwidth are divided into；In the transfer stop of A, B circuit, circuit A is used
R1 and r2, circuit B use r3 and r4；A set of base station equipment is disposed again respectively in the uplink and downlink section of each line belonging to transfer stop；
It is circuit A by frequency partition：【R2】-r1-【r2】-r1-【R2】；Circuit B：【R1】-r3-【r4】-r3-【R1】；Wherein,【r2】
【r4】For transfer stop A lines and B line base station frequencies,【R2】【R1】The respectively base station at uplink and downlink station of A, B line at transfer stop
Frequency, r1, r3 are respectively the frequency that base station is added in section.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104992583A (en) * | 2015-07-28 | 2015-10-21 | 上海厚泽信息技术有限公司 | Subway train dispatching simulation training system |
| CN105828387B (en) * | 2016-05-23 | 2017-05-31 | 深圳市立华信技术有限公司 | A kind of wireless communication system, method for processing business and device |
| CN106817705B (en) * | 2017-02-28 | 2023-06-06 | 通号电缆集团有限公司 | Track networking system compatible with WLAN and LTE-M wireless signals |
| CN106828199B (en) * | 2017-03-30 | 2023-03-17 | 北京全路通信信号研究设计院集团有限公司 | Cable anti-interference system for electrified railway section |
| CN113068182B (en) * | 2021-02-02 | 2023-02-10 | 上海大学 | Urban rail transit wireless communication information protection method based on passive reconstruction surface |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1526596A (en) * | 2003-01-30 | 2004-09-08 | 沈 | Rail transportation system of small vehicle |
| CN103067095A (en) * | 2013-01-30 | 2013-04-24 | 北京全路通信信号研究设计院有限公司 | Multi-band WIFI (wireless fidelity) parallel transmission scheme based on waveguide tube transmission medium |
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| FI20051216A0 (en) * | 2005-11-29 | 2005-11-29 | Nokia Corp | A method, system, and arrangements for establishing and maintaining a WLAN connection in a predictably moving vehicle |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1526596A (en) * | 2003-01-30 | 2004-09-08 | 沈 | Rail transportation system of small vehicle |
| CN103067095A (en) * | 2013-01-30 | 2013-04-24 | 北京全路通信信号研究设计院有限公司 | Multi-band WIFI (wireless fidelity) parallel transmission scheme based on waveguide tube transmission medium |
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